Networks : Automatically Self-Configure IP address and subnet mask

Which feature of Windows XP permits Dynamic Host Configuration Protocol (DHCP) clients to automatically self-configure an IP address and subnet mask when their DHCP server cannot be found?
1. >>APIPA
2. IPCONFIG
3. DNS
4. WINS
Explanation : Automatic Private IP Addressing (APIPA) is a feature of Windows 98/2000/XP that permits DHCP clients to automatically self-configure an IP address and subnet mask when their DHCP server cannot be found. When Windows is booting, if it cannot find a DHCP Server, APIPA configures an IP address for the computer automatically. This address is in the range 169.254.0.1 to 169.254.255.254 with a subnet mask of 255.255.0.0. The client uses this address until the DHCP server becomes available.

Domain Name Service (DNS) is used to resolve a fully qualified domain name to an IP address. When one computer needs to establish a communication session with another, the sending computer queries a DNS server for the IP address of the destination host. The DNS server responds with the IP address, which is used by the source computer to establish the connection. It does not assign IP addresses to clients.

Windows Internet Name Service (WINS) resolves NetBIOS names to IP addresses in a Windows network. It does not assign IP addresses to clients.

IPCONFIG is a utility used by Windows 2000 to view current IP configuration information. It does not assign IP addresses to clients.

Objective: Networks

Networks : Accessing the internet from computers with private IP addresses (Proxy)

Computers on your network are configured with private IP addresses that are not routable on the Internet. You want to substitute a routable Internet address when the computers need to access the Internet.
What type of server performs this function for your network?
1. DNS
2. >>Proxy
3. Gateway
4. DHCP

Explanation : A proxy server replaces a computer's configured address with its own address for Internet access. Private networks are typically configured with IP addresses that are not routable on the Internet. This will prevent computers on the network from accessing the Internet unless the configured private address is replaced by a routable IP address. This is done to help ensure the security of the network computers. Because only the proxy server address is exposed on the Internet, it is much harder for a hacker to break into the network.

A Dynamic Host Configuration Protocol (DHCP) server does not replace a computer's configured address for Internet access. A DHCP server assigns IP addresses and other TCP/IP configuration settings to network computers.

A Domain Name Service (DNS) server does not replace a computer's configured address for Internet access. DNS servers provide name registration and address resolution services.

A gateway does not replace a computer's configured address for Internet access. The term gateway, in a TCP/IP network, refers to a router. A TCP/IP gateway provides access to other network segments or networks in a routed network.
Objective: Networks

Networks: Automatic IP address assignment (DHCP)

You want Windows XP Professional computers on your network to receive an IP address automatically.
What kind of server is needed to support this?
1. >>DHCP
2. FTP
3. WINS
4. DNS
Explanation : A Dynamic Host Configuration Protocol (DHCP) server is needed to support automatic IP address assignment. Network computers lease IP addresses from the DHCP server. You can also have the DHCP server configure other IP configuration properties. These include primary and secondary Domain Name Service (DNS) server, default gateway, and NetBIOS name resolution method and, if appropriate, Windows Internet Name Service (WINS) server.

A WINS server provides NetBIOS name/IP address resolution. A WINS server is not a required part of automatic IP address assignment.

A DNS server maps TCP/IP host (network computer) names to IP addresses and provides DNS name/IP address resolution services.

A File Transfer Protocol (FTP) server supports file uploads and downloads between the server and network computers.
Objective: Networks

Networks: Assigning IP addresses

A Windows 2000 computer is configured to receive its IP address automatically. You check the computer's IP address and it is 169.254.10.1.
What does this indicate?

1. The DNS server is failing.
2. The computer cannot load the TCP/IP protocol.
3. The computer received a valid address.
4. >>The DHCP server is failing. -->Correct

Explanation : The most likely cause is that either the Dynamic Host Configuration Protocol (DHCP) server is failing or that the computer is unable to connect with the DHCP server. An address of 169.254.10.1 is one that is generated automatically by the computer when it is unable to lease an address from the DHCP server. This is referred to as an Automatic Private IP Addressing (APIPA) address. An APIPA address is generated automatically by a computer configured for automatic IP addressing if the computer is unable to contact the DHCP server to lease an IP address.

The problem is not related to the Domain Name Service (DNS) server. The DNS server maintains a table of computer names and IP addresses. It manages IP address resolution for the network.

The computer did not receive a valid address. An APIPA address is generated automatically by the computer when it is not able to receive a valid address from the DHCP server.

The problem is not that the computer cannot load the TCP/IP protocol. If the computer were unable to load the TCP/IP protocol, it would not be able to report an IP address.
Objective: Networks